Add July 2014 VM update announcement

The Android update shall be coordinated with the [documentation update](https://github.com/travis-ci/docs-travis-ci-com/pull/91).
This is true. RVM's Rubinius support is a bit strange with the current version (1.25.25) doesn't work with `rbx` (this will choose something 1.x); it requires `rbx-2` to choose 2.x, but it chooses 2.2.6, instead of the latest 2.2.10.

If you can think of a better way to explain this situation, I'm open for suggestions.